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rahix authoredThis commit introduces a way to control core 1. This is archieved by a predefined API-Interrupt: The reset interrupt. When triggered, it will bring the core back into its default state and wait for a new vector address from Epicardium. Once this vector address is transferred, it will start the new payload. This method only works as long as core 1 is responsive to the API interrupts. Cases where this might not be the case: - During times where core 1 has interrupts disabled - When in a higher priority exception handler - When core 1 has corrupted its IVT Signed-off-by:
Rahix <rahix@rahix.de>rahix authoredThis commit introduces a way to control core 1. This is archieved by a predefined API-Interrupt: The reset interrupt. When triggered, it will bring the core back into its default state and wait for a new vector address from Epicardium. Once this vector address is transferred, it will start the new payload. This method only works as long as core 1 is responsive to the API interrupts. Cases where this might not be the case: - During times where core 1 has interrupts disabled - When in a higher priority exception handler - When core 1 has corrupted its IVT Signed-off-by:Rahix <rahix@rahix.de>
common.h 1.28 KiB
#pragma once
#include "epicardium.h"
#include <stdint.h>
#include <stdbool.h>
/*
* Semaphore used for API synchronization.
* TODO: Replace this with a LDREX/STREX based implementation
*/
#define _API_SEMAPHORE 0
#define _CONTROL_SEMAPHORE 1
/* Type of API IDs */
typedef uint32_t api_id_t;
#define _API_FLAG_IDLE 0
#define _API_FLAG_CALLING 1
#define _API_FLAG_RETURNED 2
/* Layout of the shared memory for API calls */
struct api_call_mem {
/*
* Reset stub. The reset stub is a small function provided by
* epicardium that should be called by a payload when receiving the
* reset interrupt.
*/
void (*reset_stub)();
/*
* Flag for synchronization of API calls. When this flag
* is set, the caller has issued a call and is waiting for
* the dispatcher to reset the flag.
*/
uint8_t call_flag;
/* ID if the ongoing API call */
api_id_t id;
/* ID of the current interrupt */
api_int_id_t int_id;
/*
* Buffer for arguments/return value. This buffer will be
* *overflown*, because there is guaranteed space behind it.
*
* TODO: Add a maximum bounds check
*/
uint8_t buffer[1];
};
/* TODO: Make this address part of the linker script */
static __attribute__((unused)) struct api_call_mem* API_CALL_MEM =
(struct api_call_mem*)0x20080000;